Safety stop valve



l 19 Marchv 27 1 w. JONES SAFETY sToP vALv Fil'ed April 26, 1926 Patented. Mar. 1, 1927.

UNlrEn STATES PAT-ENT OFFICE.

LESLIE W. JONES, OF CHARLESTON. WEST VIRGINIA, ASSIGNOR OF ONE-THIRD T A. HOMER YOUNG AND ONE-THRD TO C. LAGO :BRIGHT7 BOTH OF CHARLESTON,

WEST VIRGINIA.

SAFETY STOP VALVE.

Application filed April 26, 1926.

This invention relates to check or safety valves for automatically cutting off the flow of a'fluid such as gas upon a cessation of pressure of the line, and has for its object to provide such a device of relatively simple and inexpensive construction which 1s reliable in operation.

A further object of the invention resides in the provision oi such a valve in which the pressure inthe conduit will assist in maintaining the valve closed after it has once been closed due to a cessation oi' pressure.

Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings; in which,

Figure 1 is a side elevation oi' the apparatus.

Figure 2 is a vertical section through the valve mechanism showing the valve in open position; and

Figure 3 is a horizontal section talren on line 343 of Fig. 2.

Referring to the drawings in greater de- 26 tail the numeral 1 indicates a valve casing in which the operating parts oi the apparatus are situated. This casing includes the body portion and a cap or top portion 2 which is bolted to the bodfy portion by means oi' bolts 3. Complementary recesses are i'ormed in the cap and body portion which provide a pocket 4 in which is seated a` flexible diaphragm 5 clamped between t-he flanges of the body portion and cap when the same are bolted together by means or' the bolts 3.

The casing 1 is also provided with a radially extending conduit 6. To the ends opposite are attached the pipe 7 forming the conduits for the gas or other i'luid under control by the valve. A partition 8 is provided within the conduit 7 and has formed therein a valve seat 9 for cooperation with the valve 10 carried on the lower end oi the vertically reciprocable rod 11. Below the valve 10 is provided removable plug 12 by means of which the conduit may be drained when necessary, and which also permits attachment of the valve 10 to the rod 11.

The casing 1 is also provided with a passage 13 opening into conduit 6 on one side Serial No. 104,717.

of the valve 10 and a. passage 14 opening into'the conduit 6 on the opposite side of the valve 10. This lat-ter passage communicates with a passage 15 formed in the cap member By this construction it will be apparent that the conduit 6 may be opened to either side of the diaphragm 5 depending upon the position of the valve mechanism, a portion of whichy has been previously described.

The upper end of the rod 11 is fiXedly secured to the center of the diaphragm 5 as indicated by numeral 16, and carried by this rod just below the upper end thereof is a second valve 17 which co-operates with a valve seat formed in the bott-om of the pocket 4. The rod as well as the two valves 10 and 17 carried thereby, is normally held at the upper limit of its reciprocable movement by means of a coil spring 18.

Located in the top of the cap 2 is the spring pressed plunger 19 vprovided with a disk 20 on its lower end which is seated within the pocket 5. The purpose of this plunger and disk, of course, is to move the valve rod 11 against the pressure of spring 18 to open the conduit 6 to the passage ot' gas or other Huid being controlled. A springpressed relief valve 21v is provided below the diaphragm 5 so that the operator may relieve the gas pressure in the compartment after valve 17 has closed. In operation, the parts being in the position shown in Figure 2, it will be apparent that the gas will flow through the conduit 6 and pipe 7 to the source of consumption and that this gas under pressure will also pass through the passages 14, 15 to the upper side of the diaphragm 6 thereby maintaining the valve 10 open against the pressure of f spring 18. Should the gas pressure decrease or entirely cease at any time the pressure will be removed from the 'upper side of the diaphragm 5 and the spring 18 will flex the diaphragm upwardly, thereby closing valve 10 and opening valve 17. This movement,

obviously, will shut otf the passage of gas through the conduit 6 and will' vopen passage 13 to the under side of the diaphragm. Should the pressure again come on it will pass up through passage 13 Vand pass the open valve 17 and assist the spring 18 in maintaining the diaphragm in its upivardly flexed position thereby positively holding the valve 10 against being opened unless it is manually opened by means ol the plunger' i9 and disk 2O secured thereto, and release of pressure below diaphragm 5 by means ot the valve Q1.

From the foregoing description taken in connection with the accompanying drawings it Will be apparent that I have devised an exceedingly simple and inexpensive construction for preventing the accidental escape of gas into living rooms and the like due to Cessation of the pressure; and that such means is controlled in part by the varying pressures of the gases themselves.

ln accordance with the patent statutes I have'described what l nov.' fe/lieve to be the best embodiment ot' the invention, but l do not Wish to be understood thereby as limiting myself or the scope ot the invention, as many changes and modifications may he Vmade Without departing 'l'rom the spirit ot the invention; all such I aim to include in the scope of the appended claims.

lVhat I Claim as new and desire to secure by Letters Patent is:

1. In a device ot the Class described,Y a valve easing having a conduit therein, a diaphragm mounted therein, a valve positiened in said conduit, a. spring pressed rod connecting said valve and diaphragm, said casing also provided With passages communicating with said conduit at opposite sides of said valve andextending to opposite sides of said diaphragm, and means ein terior of said casing for moving said valve to open position.

in a. device ot the class described, a valve easing having a conduit extending therethrough and a pocket, a valve in sait eonduit, a diaphragm in said pook-et, a seeond valve in the bottom of said pocket, a rod connecting said valves and diaphragm, said casing provided with passages leading from said conduit at opposite sides of said {inst-named valve to opposite sides of said diaphragm, one of Isaid passages being con trolled by said second-mentioned valve.

LESLIE WV. JONES 

